The coupled (heave and roll) oscillations of a ship in transverse sinusoidal waves are considered. In contrast to much of the recent research in this area nonlinear effects, fluid-structure interaction and geometry of a realistic vessel are included in the analysis. The ship hull is described by a set of realistic transverse sections and fluid influence coefficients are computed using three-dimensional linear interpolation from tables taking into account the instantaneous waterplane and the frequency of the waves. Because of the highly nonlinear and complex nature of the governing equations of motion the main thrust of this paper is based on numerical simulation. The fundamental forcing parameters of this problem are the wave height and wave frequency. As expected, large response amplitudes occur for large wave height and proximity of the fundamental frequency of the waves to a natural frequency of the vessel. However, nonlinear effects have a strong influence on these results. Several initial conditions of the system were chosen and therefore transient effects are an integral part of this study. Combinations of wave parameters leading to either steady-state motion or capsize are mapped out as 'safe' and unsafe' conditions respectively. Suggestions are made concerning how this information could be incorporated into a relatively simple criterion.

  • Supplemental Notes:
    • STAB 94, 5th Intl Conf on Stability of Ships and Ocean Vehicles; 7-11 Nov 1994; Florida, USA. Sponsored by SNAME, USA and RINA, UK. Proc. Publ by Florida Inst Technology, USA. Vol 4, session 14 [17 p, 11 ref, 8 fig]
  • Authors:
    • Donescu, P
    • Virgin, L N
  • Publication Date: 1994


  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717499
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM